The vscode-mssql repository is a large, feature-rich VS Code extension providing comprehensive SQL Server management capabilities directly within the editor. Its core functionality, derived from code rather than documentation, includes connection management (SQL Server, Azure SQL, Fabric), T-SQL query execution with a sophisticated results grid (FluentResultGrid), visual schema designer and table designer, schema comparison, database project management (build, publish, deploy via DACPAC), deployment wizards (local Docker containers, Azure SQL, Fabric), object management (create/rename/backup/restore databases), Azure firewall rule handling, and a built-in profiler and execution plan viewer. It also integrates with GitHub Copilot for natural language querying and schema exploration via Language Model Tools and an MCP server bridge. The architecture is a classic VS Code extension with a language client (SqlToolsServiceClient) communicating with a .NET-based SQL Tools Service backend over JSON-RPC, while all modern UI is implemented as React webviews using Fluent UI components. The codebase is being actively developed with a strong focus on AI integration and performance testing, but also contains some legacy patterns (e.g., SlickGrid alongside Fluent grids) and duplicated code across similar webview controllers.